关键词：
Fluid structure interaction
摘要：
In structural strength design of ships, water entry slamming load receives great attention. Here, using computational fluid dynamics - finite element method (CFD-FEM) bidirectional coupling numerical method, the fluid-structure interaction problem of an elastic wedge under gravity entering water in different flow field environments was studied. Firstly, taking wedge slamming in still water as an example, Simulation results were compared with experimental ones to verify the eorreetness of CFD-FEM. Then, slamming forces, structural responses and flow field changes of elastic wedges with different water entry velocities and bottom oblique angles were analyzed when entering water in different flow field environments of still water, flow and waves. The results showed that water entry slamming of wedge in still water is consistent with experimental results of model, so the numerical Simulation has the reliability and feasibility;under action of uniform flow, when a wedge enters water, due to wall reflection of structure to incoming flow, the flow velocity near wedge is different from that far away from incoming flow to generate a pressure difference, bottom of wedge shifts to direction of incoming flow;when entering water at different wave positions, model equilibrium position is in direction of wave velocity, as the relative slamming velocity between wave and wedge increases, the generated slamming load is larger than that in still water, high stress zone is mainly concentrated at wedge bottom and weld position;the study results can provide a guidance for ship structure design and water entry slamming study. © 2025 Chinese Vibration Engineering Society. All rights reserved.
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